Last night everything was worked and i normally shutdown the computer but today morning when i start my computer, first i didn't hear a beep sound when motherboard start, second monitor showing no signal, so i removed the graphic card, however graphic card fan was working but it is not showing anything in monitor even not booting the OS and not showing anything like Motherboard bios screen etc. When i plugged out the graphic card cable, it is started booting again and every thing was normal but again when i plugged in again not working.. I can't understand why was this happening. Please help guys.